I have several hybrids of Musa nagensium 'Florale noir' sprouted and the one I planted in my garden survived outdoor in zone 9a.
2006........................................2007
I also have a "pure" nagensium from Tropengarten, that was to small to be overwintered outside. (This picture was taken last year)
It really looks different from the 'Florale Noir' form. It has more slender and glaucous leaves.